ENGR00169872-1 rework hdmi initialization and hotplug sequence

This commit intends to implement the flowchart and details
documented in the HDMI Transmitter Controller User Guide
section entitled "Programming Model".

Some input is also from the Synopsys API code.

The HDMI specification requires HDMI to set itself to VGA DVI mode
before reading the EDID.

So follow this sequence when HDMI is hotplugged:
1.  Hdmi connector is plugged in, HDMI video gets an interrupt.
2.  Clear out video mode list.  Add only VGA DVI mode to list.
3.  Request VGA DVI mode (call fb_set_var())
4.  HDMI video driver will get FB_EVENT_MODE_CHANGE callback and
    call mxc_hdmi_setup() to set up HDMI.
5.  Read the edid and add video modes from edid.  Select the video
    mode that is similar to the command line default.
6.  Request VGA DVI mode (call fb_set_var())
7.  HDMI video driver will get FB_EVENT_MODE_CHANGE callback and
    do mxc_hdmi_setup().

Also included is a workaround for an overflow condition in the HDMI.

The frame composer has an arithmetic unit that gets updated every time
we write to one of the FC registers. But sometimes, depending on the
relation between the tmds and sfr clocks, it may happen that this unit
doesn't get updated, even though the registers are holding correct
values. The workaround for this is, after completing the controller
configuration, to rewrite one of the FC registers (i.e. FC_INVIDCONF)
three or four times with the same value, and then follow it up by a SW
reset to the TMDS clock domain (MC_SWRSTZ).

We clear the overflow condition as described above every time we
change video mode.  Also an overflow interupt handler will clear the
overflow condition if it happens again.  This overflow condition is
expected (and not a problem) when we are in DVI (non-HDMI) mode, so
we do not worry about it in that case.

Signed-off-by: Alan Tull <alan.tull@freescale.com>

2 files changed, 56 insertions, 30 deletions

diff --git a/arch/arm/plat-mxc/include/mach/mxc_edid.h b/arch/arm/plat-mxc/include/mach/mxc_edid.h
index 59688f657a25..4cbbb78ad703 100755
--- a/arch/arm/plat-mxc/include/mach/mxc_edid.h
+++ b/arch/arm/plat-mxc/include/mach/mxc_edid.h
@@ -28,6 +28,7 @@
 
 #define FB_VMODE_ASPECT_4_3	0x10
 #define FB_VMODE_ASPECT_16_9	0x20
+#define FB_VMODE_ASPECT_MASK	(FB_VMODE_ASPECT_4_3 | FB_VMODE_ASPECT_16_9)
 
 struct mxc_edid_cfg {
 	bool cea_underscan;
diff --git a/arch/arm/plat-mxc/include/mach/mxc_hdmi.h b/arch/arm/plat-mxc/include/mach/mxc_hdmi.h
index a7f22de9b407..56729b229585 100644
--- a/arch/arm/plat-mxc/include/mach/mxc_hdmi.h
+++ b/arch/arm/plat-mxc/include/mach/mxc_hdmi.h
@@ -377,6 +377,7 @@
 #define HDMI_AUD_CTS2                           0x3204
 #define HDMI_AUD_CTS3                           0x3205
 #define HDMI_AUD_INPUTCLKFS                     0x3206
+#define HDMI_AUD_SPDIFINT			0x3302
 #define HDMI_AUD_CONF0_HBR                      0x3400
 #define HDMI_AUD_HBR_STATUS                     0x3401
 #define HDMI_AUD_HBR_INT                        0x3402
@@ -564,6 +565,16 @@
  * Register field definitions
  */
 enum {
+/* IH_FC_INT2 field values */
+	HDMI_IH_FC_INT2_OVERFLOW_MASK = 0x03,
+	HDMI_IH_FC_INT2_LOW_PRIORITY_OVERFLOW = 0x02,
+	HDMI_IH_FC_INT2_HIGH_PRIORITY_OVERFLOW = 0x01,
+
+/* IH_FC_STAT2 field values */
+	HDMI_IH_FC_STAT2_OVERFLOW_MASK = 0x03,
+	HDMI_IH_FC_STAT2_LOW_PRIORITY_OVERFLOW = 0x02,
+	HDMI_IH_FC_STAT2_HIGH_PRIORITY_OVERFLOW = 0x01,
+
 /* IH_PHY_STAT0 field values */
 	HDMI_IH_PHY_STAT0_RX_SENSE3 = 0x20,
 	HDMI_IH_PHY_STAT0_RX_SENSE2 = 0x10,
@@ -584,6 +595,11 @@ enum {
 	HDMI_IH_AHBDMAAUD_STAT0_BUFFFULL = 0x02,
 	HDMI_IH_AHBDMAAUD_STAT0_BUFFEMPTY = 0x01,
 
+/* IH_MUTE_FC_STAT2 field values */
+	HDMI_IH_MUTE_FC_STAT2_OVERFLOW_MASK = 0x03,
+	HDMI_IH_MUTE_FC_STAT2_LOW_PRIORITY_OVERFLOW = 0x02,
+	HDMI_IH_MUTE_FC_STAT2_HIGH_PRIORITY_OVERFLOW = 0x01,
+
 /* IH_MUTE_AHBDMAAUD_STAT0 field values */
 	HDMI_IH_MUTE_AHBDMAAUD_STAT0_ERROR = 0x20,
 	HDMI_IH_MUTE_AHBDMAAUD_STAT0_LOST = 0x10,
@@ -750,6 +766,21 @@ enum {
 	HDMI_FC_AUDSCONF_AUD_PACKET_LAYOUT_LAYOUT1 = 0x1,
 	HDMI_FC_AUDSCONF_AUD_PACKET_LAYOUT_LAYOUT0 = 0x0,
 
+/* FC_STAT2 field values */
+	HDMI_FC_STAT2_OVERFLOW_MASK = 0x03,
+	HDMI_FC_STAT2_LOW_PRIORITY_OVERFLOW = 0x02,
+	HDMI_FC_STAT2_HIGH_PRIORITY_OVERFLOW = 0x01,
+
+/* FC_INT2 field values */
+	HDMI_FC_INT2_OVERFLOW_MASK = 0x03,
+	HDMI_FC_INT2_LOW_PRIORITY_OVERFLOW = 0x02,
+	HDMI_FC_INT2_HIGH_PRIORITY_OVERFLOW = 0x01,
+
+/* FC_MASK2 field values */
+	HDMI_FC_MASK2_OVERFLOW_MASK = 0x03,
+	HDMI_FC_MASK2_LOW_PRIORITY_OVERFLOW = 0x02,
+	HDMI_FC_MASK2_HIGH_PRIORITY_OVERFLOW = 0x01,
+
 /* FC_PRCONF field values */
 	HDMI_FC_PRCONF_INCOMING_PR_FACTOR_MASK = 0xF0,
 	HDMI_FC_PRCONF_INCOMING_PR_FACTOR_OFFSET = 4,
@@ -822,24 +853,19 @@ enum {
 	HDMI_FC_DBGFORCE_FORCEVIDEO = 0x1,
 
 /* PHY_CONF0 field values */
-	HDMI_PHY_CONF0_PDZ = 0x80,
 	HDMI_PHY_CONF0_PDZ_MASK = 0x80,
 	HDMI_PHY_CONF0_PDZ_OFFSET = 7,
-	HDMI_PHY_CONF0_ENTMDS = 0x40,
 	HDMI_PHY_CONF0_ENTMDS_MASK = 0x40,
 	HDMI_PHY_CONF0_ENTMDS_OFFSET = 6,
 	HDMI_PHY_CONF0_SPARECTRL = 0x20,
 	HDMI_PHY_CONF0_GEN2_PDDQ_MASK = 0x10,
-	HDMI_PHY_CONF0_GEN2_PDDQ_ENABLE = 0x10,
-	HDMI_PHY_CONF0_GEN2_PDDQ_DISABLE = 0x00,
+	HDMI_PHY_CONF0_GEN2_PDDQ_OFFSET = 4,
 	HDMI_PHY_CONF0_GEN2_TXPWRON_MASK = 0x8,
-	HDMI_PHY_CONF0_GEN2_TXPWRON_POWER_ON = 0x8,
-	HDMI_PHY_CONF0_GEN2_TXPWRON_POWER_OFF = 0x0,
-	HDMI_PHY_CONF0_GEN2_ENHPDRXSENSE = 0x4,
-	HDMI_PHY_CONF0_SELDATAENPOL = 0x2,
+	HDMI_PHY_CONF0_GEN2_TXPWRON_OFFSET = 3,
+	HDMI_PHY_CONF0_GEN2_ENHPDRXSENSE_MASK = 0x4,
+	HDMI_PHY_CONF0_GEN2_ENHPDRXSENSE_OFFSET = 2,
 	HDMI_PHY_CONF0_SELDATAENPOL_MASK = 0x2,
 	HDMI_PHY_CONF0_SELDATAENPOL_OFFSET = 1,
-	HDMI_PHY_CONF0_SELDIPIF = 0x1,
 	HDMI_PHY_CONF0_SELDIPIF_MASK = 0x1,
 	HDMI_PHY_CONF0_SELDIPIF_OFFSET = 0,
 
@@ -867,6 +893,16 @@ enum {
 	HDMI_PHY_I2CM_OPERATION_ADDR_WRITE = 0x10,
 	HDMI_PHY_I2CM_OPERATION_ADDR_READ = 0x1,
 
+/* HDMI_PHY_I2CM_INT_ADDR */
+	HDMI_PHY_I2CM_INT_ADDR_DONE_POL = 0x08,
+	HDMI_PHY_I2CM_INT_ADDR_DONE_MASK = 0x04,
+
+/* HDMI_PHY_I2CM_CTLINT_ADDR */
+	HDMI_PHY_I2CM_CTLINT_ADDR_NAC_POL = 0x80,
+	HDMI_PHY_I2CM_CTLINT_ADDR_NAC_MASK = 0x40,
+	HDMI_PHY_I2CM_CTLINT_ADDR_ARBITRATION_POL = 0x08,
+	HDMI_PHY_I2CM_CTLINT_ADDR_ARBITRATION_MASK = 0x04,
+
 /* AUD_CTS3 field values */
 	HDMI_AUD_CTS3_N_SHIFT_OFFSET = 5,
 	HDMI_AUD_CTS3_N_SHIFT_MASK = 0xe0,
@@ -916,27 +952,16 @@ enum {
 	HDMI_AHB_DMA_BUFFSTAT_EMPTY = 0x01,
 
 /* MC_CLKDIS field values */
-	HDMI_MC_CLKDIS_HDCPCLK_DISABLE_MASK = 0x40,
-	HDMI_MC_CLKDIS_HDCPCLK_DISABLE_DISABLE = 0x40,
-	HDMI_MC_CLKDIS_HDCPCLK_DISABLE_ENABLE = 0x00,
-	HDMI_MC_CLKDIS_CECCLK_DISABLE_MASK = 0x20,
-	HDMI_MC_CLKDIS_CECCLK_DISABLE_DISABLE = 0x20,
-	HDMI_MC_CLKDIS_CECCLK_DISABLE_ENABLE = 0x00,
-	HDMI_MC_CLKDIS_CSCCLK_DISABLE_MASK = 0x10,
-	HDMI_MC_CLKDIS_CSCCLK_DISABLE_DISABLE = 0x10,
-	HDMI_MC_CLKDIS_CSCCLK_DISABLE_ENABLE = 0x00,
-	HDMI_MC_CLKDIS_AUDCLK_DISABLE_MASK = 0x8,
-	HDMI_MC_CLKDIS_AUDCLK_DISABLE_DISABLE = 0x8,
-	HDMI_MC_CLKDIS_AUDCLK_DISABLE_ENABLE = 0x0,
-	HDMI_MC_CLKDIS_PREPCLK_DISABLE_MASK = 0x4,
-	HDMI_MC_CLKDIS_PREPCLK_DISABLE_DISABLE = 0x4,
-	HDMI_MC_CLKDIS_PREPCLK_DISABLE_ENABLE = 0x0,
-	HDMI_MC_CLKDIS_TMDSCLK_DISABLE_MASK = 0x2,
-	HDMI_MC_CLKDIS_TMDSCLK_DISABLE_DISABLE = 0x2,
-	HDMI_MC_CLKDIS_TMDSCLK_DISABLE_ENABLE = 0x0,
-	HDMI_MC_CLKDIS_PIXELCLK_DISABLE_MASK = 0x1,
-	HDMI_MC_CLKDIS_PIXELCLK_DISABLE_DISABLE = 0x1,
-	HDMI_MC_CLKDIS_PIXELCLK_DISABLE_ENABLE = 0x0,
+	HDMI_MC_CLKDIS_HDCPCLK_DISABLE = 0x40,
+	HDMI_MC_CLKDIS_CECCLK_DISABLE = 0x20,
+	HDMI_MC_CLKDIS_CSCCLK_DISABLE = 0x10,
+	HDMI_MC_CLKDIS_AUDCLK_DISABLE = 0x8,
+	HDMI_MC_CLKDIS_PREPCLK_DISABLE = 0x4,
+	HDMI_MC_CLKDIS_TMDSCLK_DISABLE = 0x2,
+	HDMI_MC_CLKDIS_PIXELCLK_DISABLE = 0x1,
+
+/* MC_SWRSTZ field values */
+	HDMI_MC_SWRSTZ_TMDSSWRST_REQ = 0x02,
 
 /* MC_FLOWCTRL field values */
 	HDMI_MC_FLOWCTRL_FEED_THROUGH_OFF_MASK = 0x1,